v4.0.0rc3

What's Changed

• Add py.typed marker file for PEP-561 support by @luolingchun in #160
• Use ruff instead of flake8 by @luolingchun in #164
• Remove experimental export markdown by @luolingchun in #161
• Fix populate_by_name when execute model_validate by @luolingchun in #167
• Optimize performance and unit testing by @luolingchun in #155

Full Changelog: v4.0.0rc2...v4.0.0.rc3